FA/FI Alveolar Ventilation — FRCA Primary MCQ
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Correct answer: D — Increased alveolar ventilation
Increased alveolar ventilation increases the rate of delivery of agent to the alveoli accelerating the rise of FA/FI. Conversely increased cardiac output increases the rate of removal of agent from the alveoli slowing FA/FI rise. Low blood:gas solubility and high inspired concentration also speed induction.
Reference: Peck Hill Williams 2014 Pharmacology for Anaesthesia and Intensive Care